WATCH: Markwayne Mullin Sworn in as DHS Secretary immigration Kristi Noem Law and Order Markwayne Mullin Oval Office Politics WATCH: Markwayne Mullin Sworn in as DHS Secretary Nick Gilbertson March 24, 2026 Markwayne Mullin officially assumed the post of Department of Homeland Security secretary on Tuesday afternoon. The post WATCH:... Read More Read more about WATCH: Markwayne Mullin Sworn in as DHS Secretary